Liquid Fluoride Thorium Reactor Fuel is Worthless for Nuclear Weapons. Gamma rays damage electronics, and are easy to detect. No terrorist bomb (nuclear or dirty) would ever be made from the isotopes of uranium in a molten salt reactor, there are much easier approaches.

High Inherent Safety - No water, no high pressure, nothing that could propel radioactive materials into the environment. Thermal expansion/contraction of molten fuel salt strongly regulates fission rate; MSR is a very stable reactor. Simple safety systems work even if no electricity or operators.

Easy Construction and Siting - Low pressure operation, so no high-pressure safety systems. No water, so no steam containment building. Reactor factory assembled, with modern quality control, sensors and communication.